chmfile.cpp
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00017 #include <qfile.h>
00018 #include "chmfile.h"
00019 #include "decompress.h"
00020
00021 uint Chm::getEncInt(QFile& f, uint &value) const
00022 {
00023 int c;
00024 uint result = 0;
00025 ulong count = 0;
00026
00027 do
00028 {
00029 c = f.getch();
00030 result <<= 7;
00031 result |= (c & 0x7F);
00032 count++;
00033 } while (c & 0x80);
00034
00035 value = result;
00036 return count;
00037 }
00038
00039 uint Chm::getName(QFile& f, QString& name) const
00040 {
00041 int len = f.getch();
00042 char *buf = new char[len];
00043 f.readBlock(buf, len);
00044 name = QString::fromUtf8(buf, len);
00045 if (name.startsWith("/"))
00046 name = name.lower();
00047 delete buf;
00048 return len + 1;
00049 }
00050
00051 uint Chm::getIntel32(QFile& f) const
00052 {
00053 uint value = f.getch() | f.getch() << 8 | f.getch() << 16 | f.getch() << 24;
00054 return value;
00055 }
00056
00057 uint Chm::getIntel64(QFile& f) const
00058 {
00059 uint value = getIntel32(f);
00060 f.at(f.at() + 4);
00061 return value;
00062 }
00063
00064 bool Chm::getChunk(QFile& f, uint chunkSize, ChmDirectoryMap& directoryMap) const
00065 {
00066 char tag[4];
00067 if (f.readBlock(tag, 4) != 4) return false;
00068
00069 if (!qstrncmp(tag, "PMGL", 4))
00070 {
00071 uint quickref_length = getIntel32(f);
00072 f.at(f.at() + 12);
00073
00074 uint pos = 20;
00075 while (pos < chunkSize - quickref_length)
00076 {
00077 uint section, offset, length;
00078 QString name;
00079 pos += getName(f, name);
00080 pos += getEncInt(f, section);
00081 pos += getEncInt(f, offset);
00082 pos += getEncInt(f, length);
00083 directoryMap[name] = ChmDirTableEntry(section, offset, length);
00084 if (name.endsWith(".hhc"))
00085 directoryMap["/@contents"] = ChmDirTableEntry(section, offset, length);
00086 }
00087
00088 return (f.at(f.at() + quickref_length));
00089 }
00090 else if (!qstrncmp(tag, "PMGI", 4))
00091 {
00092
00093 return f.at(f.at() + chunkSize - 4);
00094 }
00095 else
00096 {
00097 return false;
00098 }
00099 }
00100
00101 bool Chm::read(const QString& fileSpec, ChmDirectoryMap& dirMap, QByteArray& contents) const
00102 {
00103 QFile f(fileSpec);
00104 if (!f.open(IO_ReadOnly)) return false;
00105
00106
00107 char tag[4];
00108 if (f.readBlock(tag, 4) != 4 || qstrncmp(tag, "ITSF", 4)) return false;
00109 uint chm_version = getIntel32(f);
00110 if (!f.at(f.at() + 0x30)) return false;
00111
00112
00113 uint section_0_offset = getIntel64(f);
00114 uint section_0_length = getIntel64(f);
00115 uint section_1_offset = getIntel64(f);
00116 uint section_1_length = getIntel64(f);
00117
00118 uint contentStart = 0;
00119 if (chm_version >= 3) contentStart = getIntel32(f);
00120
00121
00122 if (!f.at(section_1_offset)) return false;
00123 if (f.readBlock(tag, 4) != 4 || qstrncmp(tag, "ITSP", 4)) return false;
00124 if (!f.at(f.at() + 12)) return false;
00125 uint directory_chunk_size = getIntel32(f);
00126 if (!f.at(f.at() + 24)) return false;
00127 uint num_directory_chunks = getIntel32(f);
00128 if (!f.at(f.at() + 36)) return false;
00129
00130
00131 for (uint i = 0; i < num_directory_chunks; i++)
00132 if (!getChunk(f, directory_chunk_size, dirMap)) return false;
00133
00134
00135 if (chm_version < 3) contentStart = f.at();
00136
00137
00138 if (!f.at(contentStart)) return false;
00139 uint resetTableOffset =
00140 dirMap["::DataSpace/Storage/MSCompressed/Transform/{7FC28940-9D31-11D0-9B27-00A0C91E9C7C}/InstanceData/ResetTable"].offset;
00141 if (!f.at(f.at() + resetTableOffset + 4)) return false;
00142 uint numResetTableEntries = getIntel32(f);
00143 if (!f.at(f.at() + 8)) return false;
00144 uint uncompressedLength = getIntel64(f);
00145 uint compressedLength = getIntel64(f);
00146 uint blockSize = getIntel64(f);
00147 uint *resetTable = new uint[numResetTableEntries + 1];
00148
00149 for (uint i = 0; i < numResetTableEntries; i++)
00150 resetTable[i] = getIntel64(f);
00151
00152 resetTable[numResetTableEntries] = compressedLength;
00153
00154
00155 if (!f.at(contentStart)) return false;
00156 uint contentsOffset = dirMap["::DataSpace/Storage/MSCompressed/Content"].offset;
00157 if (!f.at(f.at() + contentsOffset)) return false;
00158 char *compressedContents = new char[compressedLength];
00159 if ((uint)f.readBlock(compressedContents, compressedLength) != compressedLength) return false;
00160
00161 f.close();
00162
00163
00164 char *uncompressedContents = new char[uncompressedLength];
00165
00166
00167 uint window = 1;
00168 uint tmp = blockSize;
00169 while (tmp >>= 1) window++;
00170
00171
00172 uint outlen = uncompressedLength;
00173 int res = 1;
00174
00175 for (uint i = 0; i < numResetTableEntries; i++)
00176 {
00177 if (!(i & 1)) LZXinit(window);
00178
00179 uint inlen = resetTable[i+1] - resetTable[i];
00180 res = LZXdecompress((uchar*)&compressedContents[resetTable[i]],
00181 inlen,
00182 (uchar*)uncompressedContents + i * blockSize,
00183 (outlen < blockSize) ? outlen : blockSize);
00184 if (res) break;
00185 outlen -= blockSize;
00186 }
00187
00188 delete [] resetTable;
00189 delete [] compressedContents;
00190
00191 if (res == 0)
00192 contents.duplicate(uncompressedContents, uncompressedLength);
00193
00194 delete [] uncompressedContents;
00195
00196 return (res == 0);
00197 }
This file is part of the documentation for KDevelop Version 3.1.2.